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remove uhtbl - i don't think we will need it

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This commit is contained in:
Felix Fietkau 2011-02-06 17:19:35 +01:00
parent 01ad5162b2
commit 02074ab521
3 changed files with 1 additions and 716 deletions
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2
CMakeLists.txt
View file

@ -8,7 +8,7 @@ IF(APPLE)
LINK_DIRECTORIES(/opt/local/lib)
ENDIF()
SET(SOURCES avl.c blob.c blobmsg.c hash.c uhtbl.c uloop.c usock.c)
SET(SOURCES avl.c blob.c blobmsg.c hash.c uloop.c usock.c)
ADD_LIBRARY(ubox SHARED ${SOURCES})
ADD_LIBRARY(blobmsg_json SHARED blobmsg_json.c)

340
uhtbl.c
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@ -1,340 +0,0 @@
/**
* uhtbl - Generic coalesced hash table implementation
* Copyright (C) 2010 Steven Barth <steven@midlink.org>
* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include "uhtbl.h"
/* Forward static helpers */
UHTBL_INLINE uhtbl_size_t _uhtbl_address(uhtbl_t *tbl, uhtbl_bucket_t *bucket);
UHTBL_INLINE uhtbl_bucket_t* _uhtbl_bucket(uhtbl_t *tbl, uhtbl_size_t address);
static uhtbl_bucket_t* _uhtbl_allocate(uhtbl_t *tbl);
static uhtbl_bucket_t* _uhtbl_find(uhtbl_t *tbl, const void *key,
long len, uhtbl_bucket_t **previous, uhtbl_size_t *mainaddress);
UHTBL_API int uhtbl_init(uhtbl_t *tbl, uint32_t bucketsize,
uhtbl_size_t sizehint, uhtbl_hash_t *fct_hash, uhtbl_gc_t *fct_gc) {
sizehint = (sizehint) ? sizehint : UHTBL_MINIMUMSIZE;
tbl->bucketsize = bucketsize;
tbl->fct_hash = fct_hash;
tbl->fct_gc = fct_gc;
if (!tbl->fct_hash || tbl->bucketsize < sizeof(uhtbl_bucket_t)) {
return UHTBL_EINVAL;
}
tbl->payload = 0;
tbl->buckets = NULL;
tbl->used = 0;
return uhtbl_resize(tbl, sizehint);
}
UHTBL_API void uhtbl_clear(uhtbl_t *tbl) {
for (uhtbl_size_t i = 0; i < tbl->size; i++) {
uhtbl_bucket_t *bucket = _uhtbl_bucket(tbl, i);
if (tbl->fct_gc && bucket->head.flags & UHTBL_FLAG_OCCUPIED) {
tbl->fct_gc(bucket);
}
bucket->head.flags = 0;
}
tbl->used = 0;
tbl->nextfree = tbl->size - 1;
}
UHTBL_API void* uhtbl_get (uhtbl_t *tbl, const void *key, long len) {
return _uhtbl_find(tbl, key, len, NULL, NULL);
}
UHTBL_API void* uhtbl_set (uhtbl_t *tbl, void *key, long len) {
int localkey = 0;
uint16_t keysize = len, flags;
if (!key) { /* Check whether key is treated as a pointer */
key = &len;
keysize = sizeof(len);
localkey = 1;
}
uhtbl_size_t mainaddr;
uhtbl_bucket_t *resolve, *match, *prev = NULL;
uhtbl_bucket_t *lookup = _uhtbl_find(tbl, key, keysize, &prev, &mainaddr);
if (lookup) {
match = lookup;
flags = match->head.flags;
if (flags & UHTBL_FLAG_OCCUPIED) { /* We are replacing an entry */
if (tbl->fct_gc) {
tbl->fct_gc(match);
}
tbl->used--;
}
} else {
match = prev;
flags = match->head.flags;
if ((flags & UHTBL_FLAG_STRANGER)
&& _uhtbl_address(tbl, match) == mainaddr) {
/* Mainposition occupied by key with different hash -> move it away */
/* Find old prev and update its next pointer */
if ((flags & UHTBL_FLAG_LOCALKEY)) {
_uhtbl_find(tbl, 0,
match->head.key.handle, &prev, NULL);
} else {
_uhtbl_find(tbl, match->head.key.ptr,
match->head.keysize, &prev, NULL);
}
if (!(resolve = _uhtbl_allocate(tbl))) {
if (!uhtbl_resize(tbl, tbl->payload * UHTBL_GROWFACTOR)) {
return uhtbl_set(tbl, (localkey) ? NULL : key, len);
} else {
return NULL;
}
}
memcpy(resolve, match, tbl->bucketsize); /* Copy bucket data */
prev->head.next = _uhtbl_address(tbl, resolve);
flags = 0;
} else if ((flags & UHTBL_FLAG_OCCUPIED) &&
(match->head.keysize != keysize || memcmp((flags & UHTBL_FLAG_LOCALKEY)
? &match->head.key.handle : match->head.key.ptr, key, keysize))) {
/* Mainposition has different key (but same hash) */
if (!(resolve = _uhtbl_allocate(tbl))) {
if (!uhtbl_resize(tbl, tbl->payload * UHTBL_GROWFACTOR)) {
return uhtbl_set(tbl, (localkey) ? NULL : key, len);
} else {
return NULL;
}
}
prev = match;
match = resolve;
flags = UHTBL_FLAG_STRANGER; /* We will not be in main position */
prev->head.flags |= UHTBL_FLAG_WITHNEXT; /* Main now has next */
prev->head.next = _uhtbl_address(tbl, match); /* main->next = us */
}
}
if (localkey) {
match->head.key.handle = len;
flags |= UHTBL_FLAG_LOCALKEY;
} else {
match->head.key.ptr = key;
flags &= ~UHTBL_FLAG_LOCALKEY;
}
match->head.keysize = keysize;
flags |= UHTBL_FLAG_OCCUPIED;
match->head.flags = flags;
tbl->used++;
return match;
}
UHTBL_API void* uhtbl_next(uhtbl_t *tbl, uhtbl_size_t *iter) {
for (; *iter < tbl->size; (*iter)++) {
if (_uhtbl_bucket(tbl, *iter)->head.flags & UHTBL_FLAG_OCCUPIED) {
return _uhtbl_bucket(tbl, (*iter)++);
}
}
return NULL;
}
UHTBL_API int uhtbl_remove(uhtbl_t *tbl, uhtbl_head_t *head) {
void *key;
long len;
uhtbl_key(head, &key, &len);
return uhtbl_unset(tbl, key, len);
}
UHTBL_API int uhtbl_unset(uhtbl_t *tbl, const void *key, long len) {
uhtbl_bucket_t *prev = NULL;
uhtbl_bucket_t *bucket = _uhtbl_find(tbl, key, len, &prev, NULL);
if (!bucket) {
return UHTBL_ENOENT;
}
if (tbl->fct_gc) {
tbl->fct_gc(bucket);
}
bucket->head.flags &= ~UHTBL_FLAG_OCCUPIED;
tbl->used--;
/* If not in main position, get us out of the next-list */
if (bucket->head.flags & UHTBL_FLAG_STRANGER) {
if (bucket->head.flags & UHTBL_FLAG_WITHNEXT) {/* We had next buckets */
prev->head.next = bucket->head.next; /* Give them to out prev */
} else {
prev->head.flags &= ~UHTBL_FLAG_WITHNEXT;/* We were the only next */
}
bucket->head.flags = 0;
}
uhtbl_size_t address = _uhtbl_address(tbl, bucket);
if (address > tbl->nextfree) {
tbl->nextfree = address;
}
return UHTBL_OK;
}
UHTBL_API int uhtbl_resize(uhtbl_t *tbl, uhtbl_size_t payload) {
uhtbl_size_t size = payload / UHTBL_PAYLOADFACTOR;
if (size < payload || size < tbl->used) {
return UHTBL_EINVAL;
}
if (payload == tbl->payload) {
return UHTBL_OK;
}
void *buckets = calloc(size, tbl->bucketsize);
if (!buckets) {
return UHTBL_ENOMEM;
}
uhtbl_t oldtbl; /* Save essentials of table for rehashing */
oldtbl.buckets = tbl->buckets;
oldtbl.bucketsize = tbl->bucketsize;
oldtbl.size = tbl->size;
oldtbl.used = tbl->used;
tbl->buckets = buckets;
tbl->payload = payload;
tbl->size = size;
tbl->used = 0;
tbl->nextfree = size - 1;
if (oldtbl.used) { /* Rehash if table had entries before */
uhtbl_size_t iter = 0;
uhtbl_bucket_t *old, *new;
while ((old = uhtbl_next(&oldtbl, &iter))) {
new = uhtbl_set(tbl, (old->head.flags & UHTBL_FLAG_LOCALKEY)
? NULL : old->head.key.ptr,
(old->head.flags & UHTBL_FLAG_LOCALKEY)
? old->head.key.handle : old->head.keysize);
new->head.user = old->head.user;
memcpy(((char*)new) + sizeof(uhtbl_head_t),
((char*)old) + sizeof(uhtbl_head_t),
tbl->bucketsize - sizeof(uhtbl_head_t));
}
}
free(oldtbl.buckets);
return UHTBL_OK;
}
UHTBL_API void uhtbl_finalize(uhtbl_t *tbl) {
uhtbl_clear(tbl);
free(tbl->buckets);
tbl->buckets = NULL;
}
UHTBL_API void uhtbl_key(uhtbl_head_t *head, void **key, long *len) {
if (key) {
*key = (head->flags & UHTBL_FLAG_LOCALKEY)
? NULL : head->key.ptr;
}
if (len) {
*len = (head->flags & UHTBL_FLAG_LOCALKEY)
? head->key.handle : head->keysize;
}
}
UHTBL_API void uhtbl_gc_key(void *bucket) {
void *key;
uhtbl_key(bucket, &key, NULL);
free(key);
}
/* Static auxiliary */
UHTBL_INLINE uhtbl_size_t _uhtbl_address(uhtbl_t *tbl, uhtbl_bucket_t *bucket) {
return ((uint8_t*)bucket - (uint8_t*)tbl->buckets) / tbl->bucketsize;
}
UHTBL_INLINE uhtbl_bucket_t* _uhtbl_bucket(uhtbl_t *tbl, uhtbl_size_t address) {
return (uhtbl_bucket_t*)
((uint8_t*)tbl->buckets + (address * tbl->bucketsize));
}
static uhtbl_bucket_t* _uhtbl_allocate(uhtbl_t *tbl) {
uhtbl_size_t address = tbl->nextfree;
do {
uhtbl_bucket_t *bucket = _uhtbl_bucket(tbl, address);
if (!(bucket->head.flags & UHTBL_FLAG_OCCUPIED)) {
if (bucket->head.flags & UHTBL_FLAG_WITHNEXT) {
/* Empty bucket still has a successor -> swap it with its */
/* successor and return the old successor-bucket as free */
uhtbl_bucket_t *old = bucket;
bucket = _uhtbl_bucket(tbl, old->head.next);
memcpy(old, bucket, tbl->bucketsize);
old->head.flags &= ~UHTBL_FLAG_STRANGER; /* sucessor now main */
}
/* WARN: If set will ever fail in the future we'd take care here */
tbl->nextfree = (address) ? address - 1 : 0;
return bucket;
}
} while(address--);
return NULL;
}
static uhtbl_bucket_t* _uhtbl_find(uhtbl_t *tbl, const void *key,
long len, uhtbl_bucket_t **previous, uhtbl_size_t *mainaddress) {
uint16_t keysize = len;
if (!key) {
key = &len;
keysize = sizeof(len);
}
uhtbl_size_t address = tbl->fct_hash(key, keysize) % tbl->payload;
uhtbl_bucket_t *buck = _uhtbl_bucket(tbl, address);
if (mainaddress) {
*mainaddress = address;
if (!(buck->head.flags & UHTBL_FLAG_OCCUPIED)) {
return buck;
}
}
if (buck->head.flags & UHTBL_FLAG_STRANGER) {
if (previous) {
*previous = buck;
}
return NULL;
}
for (;; buck = _uhtbl_bucket(tbl, address)) {
if (buck->head.flags & UHTBL_FLAG_OCCUPIED
&& buck->head.keysize == keysize
&& !memcmp((buck->head.flags & UHTBL_FLAG_LOCALKEY)
? &buck->head.key.handle : buck->head.key.ptr, key, keysize)) {
return buck;
}
if (!(buck->head.flags & UHTBL_FLAG_WITHNEXT)) {
if (previous) {
*previous = buck;
}
return NULL;
}
address = buck->head.next;
if (previous) {
*previous = buck;
}
}
}

375
uhtbl.h
View file

@ -1,375 +0,0 @@
/**
* uhtbl - Generic coalesced hash table implementation
* Copyright (C) 2010 Steven Barth <steven@midlink.org>
* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
*/
/**
* uhtbl is a coalesced cellared generic hash table implementation with the aim
* to be both small in code size and heap memory requirements. This hash table
* uses a hybrid approach called coalesced addressing which means that pointers
* to other buckets will be used in the case of a collisions. In this case no
* linked lists have to be used and less allocation calls have to be done.
* To improve performance this hash table carries a cellar for collision
* handling which is an additional address area that lies behind the
* hash-addressable space.
*
* Overhead (on x86 32bit):
* Bookkeeping: 32 Bytes (per hash table)
* Metadata: 12 Bytes including pointer to key and keysize (per bucket)
*
*/
#ifndef UHTBL_H_
#define UHTBL_H_
/* compile-time configurables */
#ifndef UHTBL_PAYLOADFACTOR
#define UHTBL_PAYLOADFACTOR 0.86
#endif
#ifndef UHTBL_GROWFACTOR
#define UHTBL_GROWFACTOR 2
#endif
#ifndef UHTBL_MINIMUMSIZE
#define UHTBL_MINIMUMSIZE 16
#endif
#include <stdint.h>
/* Internal flags and values */
#define UHTBL_FLAG_OCCUPIED 0x01
#define UHTBL_FLAG_STRANGER 0x02
#define UHTBL_FLAG_WITHNEXT 0x04
#define UHTBL_FLAG_LOCALKEY 0x08
#define UHTBL_MAXIMUMSIZE 2147483648
/* Status codes */
#define UHTBL_OK 0
#define UHTBL_EINVAL -1
#define UHTBL_ENOMEM -2
#define UHTBL_ENOENT -3
/* API */
#if __GNUC__ >= 4
#ifndef UHTBL_API
#define UHTBL_API
#endif
#define UHTBL_INLINE static inline __attribute__((always_inline))
#else
#ifndef UHTBL_API
#define UHTBL_API
#endif
#define UHTBL_INLINE static inline
#endif
typedef union uhtbl_key uhtbl_key_t;
typedef struct uhtbl_head uhtbl_head_t;
typedef struct uhtbl_bucket uhtbl_bucket_t;
typedef struct uhtbl_config uhtbl_config_t;
typedef struct uhtbl uhtbl_t;
typedef uint32_t uhtbl_size_t;
typedef uhtbl_size_t(uhtbl_hash_t)(const void*, int len);
typedef void(uhtbl_gc_t)(void *bucket);
union uhtbl_key {
void *ptr;
long handle;
};
struct uhtbl_head {
uint8_t user;
uint8_t flags;
uint16_t keysize;
uhtbl_size_t next;
uhtbl_key_t key;
};
struct uhtbl_bucket {
uhtbl_head_t head;
};
struct uhtbl {
uint32_t bucketsize;
uhtbl_size_t size;
uhtbl_size_t used;
uhtbl_size_t payload;
uhtbl_size_t nextfree;
uhtbl_hash_t *fct_hash;
uhtbl_gc_t *fct_gc;
void *buckets;
};
/**
* uhtbl_init() - Initialize a hash table.
* @tbl: hash table
* @bucketsize: size of a bucket
* @sizehint: estimated maximum of needed buckets (optional)
* @fct_hash: hash function
* @fct_gc: bucket garbage collector (optional)
*
* Initializes a new hash table and preallocates memory.
*
* bucketsize is the size in Bytes each bucket will use but note the following:
* Each bucket needs to begin with a struct uhtbl_head_t that keeps its metadata
* in addition to the payload you want it to carry. You are advised to define a
* bucket struct with the first element being a uhtbl_head_t followed by your
* desired payload and pass the size of this struct to bucketsize.
*
* sizehint is a hint on how many distinct entries will be stored in the hash
* table. This will be used to preallocate space for the buckets and is useful
* if you know how many entries will be stored in the hash table as it avoids
* expensive rehashing cycles. sizehint should be a power of 2.
*
* fct_hash is the hash function used. It takes a constant void pointer and a
* integer as size parameter and returns an unsigned (32bit) int.
*
* fct_gc is the garbage collector for buckets. Every time a bucket gets unset
* or the hash table gets cleared or finalized the garbage collector function
* taking a pointer to a bucket will take care of doing any finalization for
* the buckets' payload and key data. You may use uhtbl_key() to get a reference
* to your key pointer or handle for deallocation or cleaning up any other
* references. There is an optionally selectable garbage collector that will
* take care of free()ing key pointers if your keys point to memory areas.
* You have to pass uhtbl_gc_key as fct_gc parameter to use it. You may also
* call this function in your custom garbage collector.
*
* WARNING: Your garbage collector function must otherwise not change the
* metadata in the uhtbl_head_t structure of the bucket else behaviour will be
* undefined for all subsequent actions.
*
*
* Example:
* struct mybucket {
* uhtbl_head_t head;
* int mypayload1;
* int mypayload2;
* }
*
* uhtbl_t table;
* uhtbl_init(&table, sizeof(struct mybucket), 32, MurmurHash2, NULL);
*
* Returns 0 on success or a negative error code.
*/
UHTBL_API int uhtbl_init(uhtbl_t *tbl, uint32_t bucketsize,
uhtbl_size_t sizehint, uhtbl_hash_t *fct_hash, uhtbl_gc_t *fct_gc);
/**
* uhtbl_get() - Get a bucket by its key.
* @tbl: hash table
* @key: key
* @len: length of key
*
* Finds and returns the bucket with a given key.
*
* Key can either be:
* 1. A pointer to a memory area then len is its length (must be < 64KB)
* 2. A NULL-pointer then len is a locally stored numerical key
*
*
* Example:
* struct mybucket *bucket;
* bucket = uhtbl_get(table, "foo", sizeof("foo"));
* printf("%i", bucket->mypayload1);
*
* bucket = uhtbl_get(table, NULL, 42);
* printf("%i", bucket->mypayload1);
*
* Returns the bucket or NULL if no bucket with given key was found.
*/
UHTBL_API void* uhtbl_get(uhtbl_t *tbl, const void *key, long len);
/**
* uhtbl_set() - Sets a bucket for given key.
* @tbl: hash table
* @key: key
* @len: length of key
*
* Sets a new bucket for the given key and returns a pointer to the bucket for
* you to assign your payload data. If there is already a bucket with that key
* it will be unset first.
*
* Key can either be:
* 1. A pointer to a memory area then len is its length (must be < 64KB)
* 2. A NULL-pointer then len is a locally stored numerical key
*
* NOTE: If key is a pointer memory management of it will be your business.
* You might want to use a garbage collection function (see uhtbl_init())
*
* NOTE: The payload area of your bucket is NOT initialized to zeroes.
*
* WARNING: Note the following side effects when setting previously unset keys:
* 1. A set may trigger several moving actions changing the order of buckets.
* 2. A set may trigger a rehashing cycle if all buckets are occupied.
* Therefore accessing any previously acquired pointers to any bucket results in
* undefined behaviour. In addition iterations which have started before may
* result in unwanted behaviour (e.g. buckets may be skipped or visited twice).
*
*
* Example:
* struct mybucket *bucket;
* bucket = uhtbl_set(table, "foo", sizeof("foo"));
* bucket->mypayload1 = 42:
*
* bucket = uhtbl_set(table, NULL, 42);
* bucket->mypayload1 = 1337;
*
*
* Returns the bucket or NULL if no bucket could be allocated (out of memory).
*/
UHTBL_API void* uhtbl_set(uhtbl_t *tbl, void *key, long len);
/**
* uhtbl_next() - Iterates over all entries of the hash table.
* @tbl: hash table
* @iter: Iteration counter
*
* Iterates over all entries of the hash table.
*
* iter is a pointer to a numeric variable that should be set to zero before
* the first call and will save the iteration state.
*
* NOTE: You may safely do several iterations in parallel. You may also safely
* unset any buckets of the hashtable or set keys that are currently in the
* hash table. However setting buckets with keys that don't have an assigned
* bucket yet results in undefined behaviour.
*
* Example:
* uint32_t iter = 0;
* struct mybucket *bucket;
* while ((bucket = uhtbl_next(table, &iter))) {
* printf("%i", bucket->mypayload1);
* }
*
* Return the next bucket or NULL if all buckets were already visited.
*/
UHTBL_API void* uhtbl_next(uhtbl_t *tbl, uhtbl_size_t *iter);
/**
* uhtbl_unset() - Unsets the bucket with given key.
* @tbl: hash table
* @key: key
* @len: length of key (optional)
*
* Unsets the bucket with given key and calls the garbage collector to free
* any payload resources - if any.
*
* Key can either be:
* 1. A pointer to a memory area then len is its length (must be < 64KB)
* 2. A NULL-pointer then len is a locally stored numerical key
*
* Example:
* uhtbl_unset(table, NULL, 42);
*
* Returns 0 on success or a negative error code if there was no matching bucket
*/
UHTBL_API int uhtbl_unset(uhtbl_t *tbl, const void *key, long len);
/**
* uhtbl_remove() - Unsets a bucket.
* @tbl: hash table
* @head: bucket head
*
* Unsets the bucket with given address and calls the garbage collector to free
* any payload resources - if any.
*
* Example:
* uhtbl_remove(table, &bucket->head);
*
* Returns 0 on success or a negative error code if the bucket was not found
*/
UHTBL_API int uhtbl_remove(uhtbl_t *tbl, uhtbl_head_t *head);
/**
* uhtbl_clear() - Clears the hashtable without freeing its memory.
* @tbl: hash table
*
* Clears all buckets of the hashtable invoking the garbage collector - if any
* but does not free the memory of the hash table. This is usually more
* efficient than iterating and using unset.
*
* Returns nothing.
*/
UHTBL_API void uhtbl_clear(uhtbl_t *tbl);
/**
* uhtbl_resize() - Resizes and rehashes the hash table.
* @tbl: hash table
* @payload: Buckets to reserve.
*
* Resizes the hash table and rehashes its entries.
*
* payload is the number of buckets the hashtable should allocate. It must be
* greater or at least equal to the number of buckets currently occupied.
*
* NOTE: Rehashing is an expensive process which should be avoided if possible.
* However resizing will be automatically done if you try to set a new bucket
* but all buckets are already occupied. In this case the payload bucket count
* is usually doubled. There is currently no automatic resizing done when the
* bucket usage count decreases. You have to take care of this by yourself.
*
* Returns 0 on success or a negative error code if out of memory.
*/
UHTBL_API int uhtbl_resize(uhtbl_t *tbl, uhtbl_size_t payload);
/**
* uhtbl_clear() - Clears the hashtable and frees the bucket memory.
* @tbl: hash table
*
* Clears all buckets of the hashtable invoking the garbage collector - if any
* and frees the memory occupied by the buckets.
*
* Returns nothing.
*/
UHTBL_API void uhtbl_finalize(uhtbl_t *tbl);
/**
* uhtbl_key() - Returns the key parameters as passed to set.
* @head: Bucket head
* @key: Pointer where key pointer should be stored (optional)
* @len: Pointer where key len should be stored (optional)
*
* This function might be useful to obtain the key parameters of a bucket
* when doing garbage collection.
*
* Returns nothing.
*/
UHTBL_API void uhtbl_key(uhtbl_head_t *head, void **key, long *len);
/**
* uhtbl_gc_key() - Basic garbage collector that frees key memory.
* @bucket: Bucket
*
* This function is a basic garbage collector that will free any key pointers.
* However it will not touch your payload data.
*
* WARNING: You must not call this function directly on any bucket otherwise
* behaviour will be unspecified. Instead you may pass this function to the
* uhtbl_init function. You may also call this function from inside a custom
* garbage collector.
*
* Returns nothing.
*/
UHTBL_API void uhtbl_gc_key(void *bucket);
#endif /* UHTBL_H_ */